Expert: Albert A. de Santis - 9/27/2011

Question
"I've recently seen paint which contains a certain amount of ceramic material. This is supposed to be extremely effective in conserving much needed cash by preventing heat transfer to the outside world. Apparently you  mix this into the selected paint pot until it has dissipated and then continue the job. I'm wondering how effective this process is and if it is as good as it appears to be?.

The colour does not seem to be affected and remains much as it was originally decided upon."

I originally asked one of the other experts but unfortunately it was out of his area of expertise. However, just what area does my question actually fall into? I'd be grateful if you could point me in the correct direction.

Answer
These coatings appear to be primarily reflectors of radiant heat, which they advertise (to me in a misleading manner) as insulation.  If you read the fine print, they do not have an R-value in and of themselves.  Instead they are advertised to improve the comfort level making it feel like you've added R value.  Again, reading the fine print, this is mostly used on the outside surface to reflect heat and reduce heat gain.  By the way, this can also be done with films on windows or even by using light colors with what are called 'cool colors' that have a high solar reflectance primarily because of the color, not some 'high tech' additive.  Google 'cool roofs' or metal roofing fabricated in 'cool colors.'  I do not find testing data on this product from ASTM or ANSI or any other reputable place that substantiates their claims.  If it worked, every metal roofing/siding manufacturer would make a product line that incorporates this type of product.  If you do find hard data, please let me know, as I enjoy learning about new #proven# products as much as the next Architect.

The paint may indeed be a solar reflector and that is fine, but I feel safe to say it does not replace building insulation.  In fact, I doubt you will find a Building Official or Energy Code that would allow it.